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1H (the region of upfield signals) and 13C (dioxane ring) NMR data of islandoquinone [28,42] and dioxabenzo[a]tetracenetetraones 23a–c in CDCl3.
| Compounds | δH(CH2(15)) | δH(CH3 (16)) | δH(Ha(17)) | δH(Hb(17)) | δH(CH3(18)) | δC(C-6a) | δC(C-7a) | δC(C-13a) | δC(C-14a) |
|---|---|---|---|---|---|---|---|---|---|
| islandoquinone | 2.96 | 1.37 | 1.79 | 2.36 | 1.05 | 146.0 | 83.0 | 93.0 | 145.0 |
| 23a | 2.95 | 1.35 | 1.79 | 2.37 | 1.05 | 147.2 | 83.7 | 92.3 | 144.2 |
| 23b | 2.92 | 1.37 | 1.75 | 2.36 | 1.04 | 146.1 | 82.6 | 92.4 | 136.2 |
| 23c | 2.55 | 0.97 | 1.69 | 2.34 | 1.17 | 144.2 | 92.8 | 83.1 | 138.3 |
